Rotary speed indicator



P. M; FAvREv-BULLE. ROTARY SPED INDICATOR. APPLICATION FILED IUN'ES. i919.

Pi-nted Apr. 25, 1922.

`2 SHEETS-SHEET l.

dR. M. 'FAvRE-RULLE. ROTARY SPEED INDICATOR. APPucATloN FILED :URE 5, 1919.

1,414,268. Famed Apr. 25, 19.22.vl`

2 SHEETS- SHEET 2.

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are adapted to move apart by the actionV efv centrifugal force.V vThe movement of these masses causesan indicating needle tov rotate Umranstares ROTARY srnnn ritriDIcaToi-t.v

Specification of Letters Patent.

Patented Apr. 25, 1922.

Application filed June '6, 1919. Serial No 302,312.

(GRANTED UNDER THE raovIsIoNs OFTHEACT or MARCH s, 1921, 41 STATQL, 1313 7 T 0 allwlwm t may concern Be it known that I, PHILIPPE MAURICE FAvRn-BULLR, otherwise known as FAVRE- HEINRICH, a citizen of the French Republic,v residing at N o. 17 Rue Gambetta, Boulognesur-Seine, France, have invented certain new and useful Improvements in Rotary Speed Indicators, (for which I have filed an application in 'France October 12, 1917, Patent No. 493,877 of which the following is a specification. Y l

This invention has for its object to provide an improved rotary speed indicator, that is to say, an apparatus 'for indicating the number of revolutions of a rotating member. I

The improved speed -indicator k comprises a shaft which is 'revolved by motion transmitted from the member the number of' revolutions lof which it is desired to Indicate. Thisshaft carries'two rockingV masses which past a graduated scale. This indicating needle assumes a position of equilibrium under the influence of centrifugal force and The connection be-V 7 tween the 'masses subjected to centrifugal' an opposing spring.

force and theindicatingneedle is such that the movements oI" the latter are-proportinal to the speedof rotation ,of the memberthe number of revolutions of which it is desired to ascertain. A 1 v Fig. l illustrates diagrammatically `the principle of the improved speed indicator; 2 is a view in elevation partly in sec'- tion; 1 f l f Fig. 3 is a view in elevation partly in section on the 1in@ In, III 0f-Fig. 2;

Fig. l illustrates on a largerscalev thev contact between "the rod acted upon by vcen'- trfugal torce andthe lever thatguidesthe needle; f

Fig. 5 is a diagrammatic view of the mannerof fixingthe speed indicator toa sup porting wallgand Fig. 6 is asectional view on thev line VI,

VI of Fig. 2. i1 f Referring more particularly to the Fig. l,

let XY be` the vertical axis of the apparatus,

OPO the plate'on which is pivoted at Oa rod carrying amass having its center of gravity at C AM a rod connectin tl rod 0A tothe viartical axis. Y y g le. Bytheaetion of the centrifugal force the mass 1S sub]ected to a force applied at C and {Fmwzt The point O being iixed said force will beV replaced by the A and equal:

Barmenia ,PATENT orties. i

parallelioice H appliedat v IVe may break up the forceII along the" directions AQ and MA. It-is replaced by 5I wh1c h, pass1ng through the `fixed point O, ist I /Lilhfied, and I which will be transmitted mass `whose center of gravity isC, we getj at Mftwoforces I and I, symmetrical with 7o l' By doing the same with the symmetrical .respect to the axis XY.7 andthe resultant l l oi which is directed `along said axis:

sin a=sin b=sin .(a-l-b) from which Y Y l Hsinasinb'f sin (It-tb) fromwhich v IVe put 2Km'zconstantzKl and we simcot gte-|- cot ga If lO/a isapfproximately o` v 1 29/6-1s suifcientlyacute cotV ga 1s very slight andnegligible before cot gb we thus have f vThis vexpression is'composed of two variable terms 4 1 O /,.which, within sufiiciently approximate limits may be considered as proportional to apower of ,w greater than 2.

2O/tgb, which is also function of fw.

lf we make the curve of g?) operate with/w Yit is found that` tgl) decreases when LU increases and maybe taken as proportional to a power of to less thanV O.

It is evident that b revulatin'o:` the lenoths y n o b of OP., 0e., OM by trial lwe may obtain a value of R which within narrow limits varies proportional to w.V Y v l InY the devices Aconstructed, 013:2 centimeters, @A2275 centimeters and AM 9.5O

must be present in the apparatus aeV a remaining'approximate to 90o l))remaining very acutefalways less than GOO 1 is the frame plate to which is fixed-a sleeve 2 'that servesV as a bearing for a shaft 3, which is adapted to be connected to the device whose speed of rotation it is Vdesired, to

- measure lThe shaft 3 ends in a plate 4; to

which are fixed by means of their lower ends cylindrical j-:rnasses'Y 5, 6, whose centers of gravityiare', 6', capable of rocking on pivot pins 7,8,at right-angles to the 'axis of rotation.v Y ,v

` The Vcylindrical masses 5 and 6 are prolonged by arms '9 and 10to the ends of which i areepivotally jointed at 11, l2,Y CODUGCD rods 13, 14, the two otherends'of which are lconnected at 15 to the lower part of a movablerod 16. `This rod 1G is guided at its lower part in asleeve 17 of the plate 4 andatlits upper fpart in a cross piece 18 supported by two pillars 19 and 20 iixed to the plate fl.

The pivots 7 and 8 are placedat a rela-V Y tively Lgreat distance from the general axis of the apparatus and the centers of gravity ofthe centrifugal masses 5 and 6 very close to these pivots, so that when the speed of rotation varies the distance of'these centers of i gravity to the general axis of the apparatus i varies slightly.. The result is that the centrifugal force varies substantially in proportion to the square of` the; speed.

The lengths ofthe different' rods and links ,y aredetermined by experiment in such manner that said elevation of therod l-loe substantially proportional to the angular speed of the source of rmovement within certain deg termined limits. Itis possible to yrealize this proportioning. if the` rods 9V and 10 remain ap'piozriniately parallel with the vertical axisv and the angle ofV the rods 13 and 111 with the Referring now to the Figs. 2,v 3, (i,

horizontal be very acute and in Yanycase is lessV than 600..

Upon the upper part ofthe; rod 16 there bears a lever 21 which is fulcrumedV at 22 `and has Viixed to it a toothed sector 23which mesheswitha pinion 2Limounted onthe axle o lof the indicating needle. The .leverj21 and the toothed sector 23 fixedthereto are balanced as regards the axisof rotation 22 by a weight 25 which can be adjusted asfto 'position. The lever 21 is acted upon at its end in the opposite direction byja coiled spring 26 attached at its other end at 27 to a fixed point'ofthe frame. Thisspring is held only at its two ends, and is otherwise not subjected to any friction, andthe-effort which it exerts upon the end of the lever2l .is proportionalto its elongation, and conse'- quently to the angular .displacements ofthe .completely free. Under these conditions it is A.

lever 21. That is to say, the spring maybe f soy chosen that its pull will constantly 'counter-balance the raising strainV exerted bythe rod 16. y ,i f

The shaft 3 will be Agenerally connected tothe rotary device whose speed of rotation it is desired to measure,by means of a flexible shaft consisting yof a cable revolvingvina sheath, Transmissions of this kind have the defect of notl following in an absolutely regular manner the motion ofthe. vrotating device, owingv to the fric-tion occurring.be`

Ytw'eenthe cable and; its sheatlnso rthatytheV shaft jwill be subjected tojsudden'fluctuw i tionsY of speed.V Theresult vwill' bef that the rod 16 will be subjected tosudden risings fwhich will cause the indicating needleV to Vjump, along its scale. VThis drawback Yis avoided according to the presentl invention by causing the indicatingneed-le tobe driven bya fly-wheel 28 ofconsiderable mass rela` 1;,

tively to the yneedle,this driving being -effected by mea'nslof a small pinion .'29 iixed yon the axle oftheflyfwhleel, ,andy 'of aflargev pinionY 30 fixed on theaxle'of the needle.

When the needle is moving slowly, it 'has` no dilficulty in causingthe fly-wheel to turn,

and the presence of the latter does not change in any way the position of Vequilibriumrof the needle. Y But if the needlev is subjectedy to.

a sudden Vmovement the momentum of this kmovement rwill be absorbedrbyf'a sudden jumping aroundof-.the ily-wheel..V 28,- with the l result t'hat jumps of'the'f-needle will bepractically prevented. Y

The'contact between the'ro'd 16 which is f `subjectedto rotation and theleve'r; 21 which Vis fixed, presents some difficulty when is.,

desiredto'favoid frictionKa-nd wear. 1 Y In order to remedy this drawback in the improvedi'apparatus according Yto the A'pres'- yr ent invention, the rod,terininates(Fig.

in a 'dat jewel 31, and thelever 21 carries a spherical jewel132 4whichrest's upon the first Y Y mentioned jewel. Owing to theV shape of those surfaces the movements of the rod 16 Moreover, the space comprised between the two jewels 31 and 32 around their point of contact has such a shape that if a drop of `oil is placed thereon, this oilwill form a meniscus having an outer concave surface', the capillary tension of which is suiiicient to prevent any projection of the oil during the masses fixed on said pivots, two arms fixed l rotation of the rod 16.

As above stated, the moving parts of the speed indicator are supported by the sleeve 2 which is fixed on the frame plate 1 (Fig. 5). The casing of the apparatus consists of a cover 33 through which the sleeve 2 Y extends freely without touching it; it is provided-with a flange bearing against the frame plate 1; It is completed by `a glass cover 34, likewise provided withV a flange, fitted to the other side of the frame plate.

When the apparatus is to be fixedv to a supporting wall 35, thisis done by means of a certaian number of screws 3,6 passing through the twoiianges and the frame plate. lIhe frame plate 1 is thus fixed directly on the wall 35, and this arrangement has the advantage ofv giving to the frame Vplate a great rigidity in withstanding the strains transmitted by the driving gear or shafting. In mounting similar apparatus employed hitherto, the-frame plate supporting vthe mechanism is generally fixed in the casing, and it is the casing that is fixed to the supporting wall. That arrangement affords an insuiiicient degree of rigidity. The direct fixing of the frame plate to the supporting wall according to the present invention'allows also of considerably reducingthe weight of the casing, which is a saving.

IVhat I claim ,is:-

1. Ina rotary speed indicatoigthe combination of a shaft receiving rotation from the member whose speed of rotation it is tovmeasure, a plate perpendicular to` said shaft, pivots carried by the plate, two centrifugal masses fixed on the pivots, twov arms fixed on said centrifugal masses in the same diametral plane passing through the axis of the plate, the said arms being nearly parallel with the said axis, a movable rod at the center of said plate and perpendicular thereto, oblique rods fixed on the one hand to the upper end of said arms and on the other to the base of said rod, the oblique. rods forming with the horizontal an angle less the than 600, a balanced rocking lever bearingV upon theend of said rod, a toothed sector fixed to said lever, a framing, and a coiled spring entirely free throughout` its length c fixed to one end to said lever and atits other end to the framing.

2. In a rotary speed indicator, the combination of a shaft receiving rotation from the member whose speed ofrotation it'isj to measure, a plate perpendicular to saidy shaft, pivots on said plate, two centrifugal' obliqueirods forming with the horizontal anA 'i angle less than 600 a balanced rocking leverj bearing upon the end of said rod, a toothed sector fixed on said lever, a framing, and a coiled vspring entirely free throughout its length fixed to one end of the lever and to its'other end with the framing. 3. VIn a rotary speed indicator, the combination of a shaft receiving rotation from the i member whose speed' of rotation it is tov measure, a plate perpendicular to said shaft, pivots carried by theplate, two centrifugal *y masses fixed on said pivots, two arms fixed' on said centrifugal `masses inthe same d1- ametralplane passing through -the axis of j i plate, the said arms being nearly parallel with the said axis, a movable rod at the center of said plate and perpendicular thereto, oblique rods fixed on the one hand tothe upper end of said arms and on the other to the base of said rod, the oblique rods forming with the horizontal an angle less than 600, a balanced rockinglever car-V rying a bearingmember for coaction with the bearing on the rod, a toothedA sector' i fixed to said lever, a small pinion meshing with said sector, a toothed wheel integralV with said small pinion, a second small pinioxsv ion meshing with said toothed wheel, a circular fly wheel integral with the last menfy f tioned pinion, a framing and a coiled spring entirely free throughout its length fixed at one end of the lever and its other end to the framing. i

In testimony whereof I have signed my naine to this specification-.i

PHILIPPE MAURICE FAVRE-BUILLE. 

